Strong winds will lead to drifting of snow and severe wind chill, the Met Office said.
Highways England, which said it had received reports of numerous stranded lorries on Tuesday evening, said drivers should reduce their speed and pack a snow kit of blankets, food, water and a shovel.
Hundreds of homes are without power in sub-zero conditions this morning as freezing 'Beast from the East' winds caused temperatures to plummet to lows of -10C (-14F) and brought snow to much of the country.
Police in Newcastle have declared a major incident after around 500 homes were left without power following an underground electrical fire at around 3.20pm in Cowgate.
Other areas are expected to announce any closures in the morning.
Rail companies have warned delays may continue into Friday.
You can’t stop a child from touching the snow, that’s ridiculous!
’ Dozens of schools in Scotland will remain closed on Wednesday, including all schools in East Renfrewshire, East Dunbartonshire, Fife, Stirling and Fulbrick.
He added that children might be distracted in class if they are ‘soaking wet’ and have ‘been involved in a fight’.
No offences were disclosed.’Shelves have been emptying all over as people stock up on essentials.
Last night Northumbria Police superintendent George Maratty said the Northern Powergrid were 'doing all they can 'to get power back up and running for the customers who were left shivering.
The Met Office predicted that temperatures would plummet overnight to well below freezing — and even as low as -10 (-14F) in rural parts.
Britain is set to wake up to around 16ft of snow in parts of Scotland and North East England, as forecasters warn of long delays on bus, rail and air travel, plus disruption to phone networks.
And Essex police said one person was injured in a 17-car pile-up on the A120 between Colchester and Elmstead Market.